CN201663656U

CN201663656U - Double-hole user box of cable television

Info

Publication number: CN201663656U
Application number: CN2010201105544U
Authority: CN
Inventors: 柳琴华; 王乃文
Original assignee: Quanzhou City Shitong Optoelectronic Network Co Ltd
Current assignee: FUJIAN ZHONGGENG SHITONG INFORMATION TECH CO LTD
Priority date: 2010-02-08
Filing date: 2010-02-08
Publication date: 2010-12-01
Anticipated expiration: 2020-02-08

Abstract

The utility model relates to the field of cable televisions, in particular to a double-hole user box of a cable television. A JP1 input signal terminal, a C2 high-voltage isolation capacitor and a T1 inductor are sequentially connected in series and then are divided into two branch circuits for respectively outputting a TV television signal and an FM frequency modulation broadcasting signal, a serial resonance circuit of the C2 high-voltage isolation capacitor and the T1 inductor is connected with a C5 high-voltage isolation capacitor for providing the output of the TV television signal, the other branch circuit of the serial resonance circuit of the C2 high-voltage isolation capacitor and the T1 inductor is connected with a high-pass filter, the high-pass filter and a filter inductor are sequentially connected in series after the high-pass filter passes through the filter inductor, a first signal is coupled with a serial resonance circuit of a high-voltage isolation circuit, a C3 capacitor and an L1 inductor, and a second signal outputs the FM frequency modulation broadcasting signal after the second signal is coupled with the high-voltage isolation circuit. Because of the arrangement of the structure, the user box overcomes the defect of the function of a traditional user box, is provided with the three-port equipment of an IN input terminal, a TV one-way output terminal and an FM one-way output terminal and has strong anti-jamming capability and strong capability of resisting high-voltage shock.

Description

A kind of cable TV diplopore subscriber box

Technical field

The utility model relates to wired TV domain, is specifically related to a kind of cable TV diplopore subscriber box.

Background technology

Existing cable TV subscriber's box is generally two ports, and (promptly a signal changes end and a TV TUV signal output part equipment over to, along with cable TV network from single TV transmission red-letter day when the full bidirectional multifunctional integrated information network development, poor performance has appearred in existing subscriber box, function waits wretched insufficiency inadequately, has hindered to resemble the use of cable modem equivalence according to equipment.

Summary of the invention

The purpose of this utility model provides a kind of cable TV diplopore subscriber box, and low insertion loss, high shadow loss have one way signal transmission and Double Data output function.

A kind of cable TV diplopore subscriber box, successively by JP1 input signal end, C2 high pressure isolation capacitance, the T1 inductance bifurcation road of connecting is then exported TV TV signal and FM fm broadcast signal respectively, described C2 high pressure isolation capacitance and T1 inductance series resonant circuit connect C5 high pressure isolation capacitance the output of TV TV signal are provided, described C2 high pressure isolation capacitance and another branch road of T1 inductance series resonant circuit connect a high pass filter, the described high pass filter first signal coupling high pressure buffer circuit of connecting successively behind filter inductance, C3 electric capacity, L1 inductance series resonant circuit, output FM fm broadcast signal behind the secondary signal coupling high pressure buffer circuit.

The described first signal coupling high pressure buffer circuit and the secondary signal coupling high pressure buffer circuit high pressure of connect after by the coupling of C9 electric capacity Q1 resistance signal in parallel is isolated C10 electric capacity and is constituted described high pressure isolation C10 capacity earth.

Described high pass filter T1, TV TV signal end and FM fm broadcast signal end are connected to C1 high pressure isolation capacitance, C7 high pressure isolation capacitance, C8 high pressure isolation capacitance respectively, and described C1 high pressure isolation capacitance, C7 high pressure isolation capacitance, C8 high pressure isolation capacitance be ground connection respectively.

Described another branch road of high pass filter T1 connects series connection C6 high pressure isolation capacitance behind the R1 reset switch, described R1 reset switch C4 filter capacitor in parallel, described C6 high pressure isolation capacitance ground connection.

Owing to be provided with said structure, subscriber box has overcome the insufficiency of function of existing subscriber box, has three port devices of IN input and TV, the unidirectional output of FM, and antijamming capability is strong, and anti-impacting with high pressure ability is strong.

Description of drawings

Fig. 1 is the circuit theory diagrams of a kind of cable TV diplopore subscriber box of the present utility model.

Embodiment

As shown in Figure 1, a kind of cable TV diplopore subscriber box, after C2 high pressure isolation capacitance 2 and T1 inductance 3 series resonances, the bifurcation road export TV TV signal 4 and FM fm broadcast signal 5 respectively by IN input signal 1, described C2 high pressure isolation capacitance 2 connects C5 high pressure isolation capacitance 41 with T1 inductance 3 series resonant circuits TV TV signal output 4 is provided, described C2 high pressure isolation capacitance 2 connects a high pass filter 53 with another branch road of T1 inductance 3 series resonant circuits, and described high pass filter 53 is successively through the first signal coupling high pressure buffer circuit, filtering C3 electric capacity 54, output FM fm broadcast signal behind the L1 inductance 51 secondary signal coupling high pressure buffer circuits.

The described first signal coupling high pressure buffer circuit and the secondary signal coupling high pressure buffer circuit high pressure of connecting after by the 521 Q1 resistance 522 signal couplings in parallel of C9 electric capacity is isolated C10 electric capacity 533 and is constituted, and high pressure is isolated C10 electric capacity 533 ground connection.

Described high pass filter 53, TV TV signal 4 and FM fm broadcast signal 5 are connected to C1 high pressure isolation capacitance 61, C7 high pressure isolation capacitance 42, C8 high pressure isolation capacitance 54 respectively, and described C1 high pressure isolation capacitance 61, C7 high pressure isolation capacitance 42, C8 high pressure isolation capacitance 54 be ground connection respectively.

Described high pass filter 53 another branch roads connect R1 reset switch 62 back series connection C6 high pressure isolation capacitances 63, described R1 reset switch C4 filter capacitor 622 in parallel, C6 high pressure isolation capacitance 63 ground connection.

Claims

1. cable TV diplopore subscriber box, it is characterized in that: successively by JP1 input signal end, C2 high pressure isolation capacitance, the T1 inductance bifurcation road of connecting is then exported TV TV signal and FM fm broadcast signal respectively, described C2 high pressure isolation capacitance and T1 inductance series resonant circuit connect C5 high pressure isolation capacitance the output of TV TV signal are provided, described C2 high pressure isolation capacitance and another branch road of T1 inductance series resonant circuit connect a high pass filter, the described high pass filter first signal coupling high pressure buffer circuit of connecting successively behind filter inductance, C3 electric capacity, L1 inductance series resonant circuit, output FM fm broadcast signal behind the secondary signal coupling high pressure buffer circuit.

2. according to the described a kind of cable TV diplopore subscriber box of claim 1, it is characterized in that: the described first signal coupling high pressure buffer circuit and the secondary signal coupling high pressure buffer circuit high pressure of connect after by the coupling of C9 electric capacity Q1 resistance signal in parallel is isolated C10 electric capacity and is constituted described high pressure isolation C10 capacity earth.

3. according to the described a kind of cable TV diplopore subscriber box of claim 1, it is characterized in that: described high pass filter T1, TV TV signal end and FM fm broadcast signal end are connected to C1 high pressure isolation capacitance, C7 high pressure isolation capacitance, C8 high pressure isolation capacitance respectively, and described C1 high pressure isolation capacitance, C7 high pressure isolation capacitance, C8 high pressure isolation capacitance be ground connection respectively.

4. according to the described a kind of cable TV diplopore subscriber box of claim 1, it is characterized in that: described another branch road of high pass filter T1 connects series connection C6 high pressure isolation capacitance behind the R1 reset switch, described R1 reset switch C4 filter capacitor in parallel, described C6 high pressure isolation capacitance ground connection.